Chris Abouzeid, Anatopsis. Except for the fact Ward calls this novel "new" (it was written 20 years ago) and rides on the coat tails of Jane Yolen and Rick Riordan, it's a good review. ("witty romp"). ETA: Michele reminds me that the first draft was written 20 years ago, but that Abouzeid rewrote Anatopsis for publication. (Thanks, Michele!) Still, it's not derivative.